Clear-to-Send:
Direction-from
data communication equipment.
This
signal is generated by
the
data communication equipment and
indicates whether
or
not the data set (modem)
is
ready
to
transmit
data. The "on"
condition
is
an indication to the data terminal
equipment
that the
data set can accept
data on the Transmit
Data
circuit.
The "off
condition
is an indication
to the data terminal
equipment
that
it
should
not
transfer
data to the data set.
Data Set Ready:
Direction-from
data communication
equipment.
This
signal indicates the
status of the local
data set to the
data
terminal equipment.
The
"on" condition of this circuit
indicates
that the
data communication
equipment
is not in test,
talk or dial
mode and has
completed
any timing functions
required to complete
call
establishment
(answer
tone, etc.). The
"off condition will
appear at all other
times and
indicates that
the data terminal should
accept only Ring Indicator
signals and ignore all other
signals
(appearing
on any other
interchange
circuit).
Data Terminal Ready:
Direction-to
data communication
equipment.
This
signal is used to control
the
switching
of the data communi-
cation equipment
to the
communications
channel. The
"on"
condition
indicates to
data communication
equipment that it
should connect
to the
communications channel
and that it should
maintain the
connection
as long as the "on" condition
is present.
The "off
condition
causes the
data communication
equipment
to be removed from
the
communications channel
following any
in-process
transmission
of data.
Ring
Indicator:
Direction-from
communication
equipment. The
"on"
condition of the
circuit indicates
that
a ringing signal is being
received
on the
communications
channel. In
general, this means
that the
data
set is being
polled
and that data communication is
desired
by the polling
device.
The
"off condition
is
held
during
the
off segment of the
ringing
cycle
(between actual rings)
and at all
other times when ringing
is not being
received.
Carrier
Detect
(Receive Line
Signal Detector):
Direction-from data
communication
equipment.
When
"on", this signal indicates
that
the data
set is receiving
a carrier from a remote data set via the
communications
channel.
The
"off condition indicates that
no
carrier
is being received
or that the signal quality
is
unsuitable for
data demodulation.
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